Closed Baseband version: unknown or imei null_null

[jhay321010]

Samsung galaxy s4 lte-a e330s korean nakapag flash na ako ng firmware
2016-10-06 South Korea (SK Telecom) 5.0.1 E330SKSUDOL4 E330SYKTDOL4
baseband version:
unknown?
And also already tried to go back kitkat.
2014-10-16 South Korea (SK Telecom) 4.4.2 E330SKSUCNJ1 E330SSKTENJ1
same issues:
baseband version:
UNKNOWN..

any solution mga pka phcorner.

salamat po..

help naman guys..

salamat ulit.!